Merge test suite.
diff --git a/testsuite/tar/tar-demands-at-least-one-ctx b/testsuite/tar/tar-demands-at-least-one-ctx
new file mode 100644
index 0000000..3ac58e8
--- /dev/null
+++ b/testsuite/tar/tar-demands-at-least-one-ctx
@@ -0,0 +1,5 @@
+if busybox tar v; then
+	return 1
+else
+	return 0
+fi